Alright, let's work through 1070 times 3999 step by step
1070 × 3999 = 3999 × (1070)
+ 3999 × 0 resulting in 0
+ 3999 × 70 yielding 279930
+ 3999 × 000 giving us 0
+ 3999 × 1000 what gives us 3999000

= 4278930
